Sbt seems to be doing rather well, using full Scala in configurations.

I think package descriptions should be limited, but not syntactically. Using 
some specific monad might work OK.

> On 16 Sep 2016, at 09:22, Alan & Kim Zimmerman <alan.z...@gmail.com> wrote:
> 
> The more power you put into the package file description, the harder it is 
> for the surrounding ecosystem to reason about it.
> 
> So if you can execute arbitrary code in a new-gen cabal file, apart from the 
> security aspects, it becomes difficult to be sure what is actually being 
> specified, if you do not reproduce the original environment when evaluating 
> the file.
> 
> Alan
> 
> On Fri, Sep 16, 2016 at 9:18 AM, Harendra Kumar <harendra.ku...@gmail.com> 
> wrote:
> On 16 September 2016 at 12:35, Imants Cekusins <ima...@gmail.com> wrote:
> Why not adopt (a subset of) .hs AST file format to structure both project and 
> package files?
> 
> Aha, that's my preferred choice. If there is a way to restrict features and 
> we can allow just a subset we can have a nice configuration language which is 
> a real language. In fact, I have been toying around this. If we have to 
> express not just a package specification but a sophisticated build 
> configuration, we need a real language. Expressing conditionals, reuse etc 
> becomes a compromise in a purely declarative language.
> 
> For example make has so many built-in functions in it that it has become a 
> full fledged language by itself. The google bazel build uses python as the 
> build config language. Haskell will make a much better choice for such use 
> cases. Pure declarative is a pain for such use cases.
> 
> -harendra
> 
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